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## Homework Statement

Here's the problem:

A particular racecarcan cover a quartermile track (402m) in 6.40s starting from standstill. Assuming that the acceleration is constant, how many "g's"(all i know is that it means accleration due to gravity) does the driver experience? If the combined mass of the driver and the racecar is 485kg, what horizontal force must the road exert on the tires?

## Homework Equations

1. Δy(displacement) = [(Velocity

_{initial})(Δt)] + ((1/2)acceleration)(Δt)

^{2}

2. Force

_{grav}+ (acceleration)(mass)= Force

_{total}

I'm not even sure if the second equation even exists but thats what i made out from the problem.

## The Attempt at a Solution

I tried solving for the "g's" using the first equation and i substituted the possible things:

402m = [(0m/s)(6.4s)] + [((1/2)a)(6.4s)]

i don't know if this is the right equation but its the closest that i can get

then i tried solving for the horizontal force with the second equation and substituted the given:

[(-9.8m/s

^{2})(485kg)] + [(19.6m/s

^{2})(485kg)] = Force

_{total}

and in case oyu are wondering where i got the acceleration(19.6m/s

^{2}) its from the first equation i solved (which i think is wrong)

Thank you in Advance!

-yandereni